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Chronobiology International
The Journal of Biological and Medical Rhythm Research
Volume 4, 1987 - Issue 2
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Original Article

Induction of Early Seasonal Sensitivity to Melatonin in Suffolk-Cross Ewes

A. M. Symons Department of Biochemistry, University of Surrey, Guildford, Surrey, GU2 5XH, UK
,
J. Arendt Department of Biochemistry, University of Surrey, Guildford, Surrey, GU2 5XH, UK
,
A. L. Poulton Department of Biochemistry, University of Surrey, Guildford, Surrey, GU2 5XH, UK
&
J. English Department of Biochemistry, University of Surrey, Guildford, Surrey, GU2 5XH, UK
Pages 219-223 | Received 01 Oct 1986, Accepted 01 Dec 1986, Published online: 07 Jul 2009

References

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  • Bittman E. L. Melatonin and photoperiodic time measurement: Evidence from rodents and ruminants. The Pineal Gland, R. J. Reiter. Raven Press, New York 1984; 155–192
  • Kennaway D. J. Pineal function in ungulates. Pineal Research Reviews 1984; 2: 113–141
  • Tamarkin L., Baird C. J., Almeida O. F. X. Melatonin: A coordinating signal for mammalian reproduction?. Science 1985; 227: 714–720
  • Nett T. M., Niswender G. D. Influence of exogenous melatonin on seasonality of reproduction in sheep. Theriogenology 1982; 17: 645–651
  • Kennaway D. J., Gilmore T. A., Seamark R. F. Effects of melatonin feeding on serum prolactin and gonadotrophin levels and the onset of seasonal estrous cyclicity in sheep. Endocrinology 1982; 110: 1766–1772
  • Arendt J., Symons A. M., Laud C. A., Pryde S. J. Melatonin can induce the early onset of the breeding season in ewes. J Endocrin 1983; 97: 395–400
  • Bittman E. L., Karsch F. J. Nightly duration of pineal melatonin secretion determines the reproductive response in inhibitory daylength in the ewe. Biol Reprod 1984; 30: 585–593
  • Nowak R., Rodway R. G. Effect of intravaginal implants of melatonin on the onset of ovarian activity in adult and prepubertal ewes. J Reprod Fert 1985; 74: 287–293
  • Engish J., Poulton A. L., Arendt J., Symons A. M. A comparison of the efficiency of melatonin treatments in advancing oestrus in ewes. J Reprod Fert 1986; 77: 321–327
  • Sauer M. J., Foulkes J. A., Worsfold A., Morris B. A. Use of progesterone 11-glucuronide-alkaline phosphatase conjugate in a sensitive microtitreplate enzyme immunoassay of progesterone in milk and its application to pregnancy testing in dairy cattle. J Reprod Fert 1986; 76: 375–391

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